Swimming in a pool is different from swimming in the sea because pools have clear water and no waves. Pools are also usually warm, so they're comfortable to swim in all year. The sea, on the other hand, has waves and tides, and you can see fish and other sea animals.
在游泳池中游泳與在海洋中游泳是不同的,因為游泳池的水清澈,沒有波浪。游泳池通常也很溫暖,所以全年都很適合游泳。另一方面,海洋有波浪和潮汐,還可以看到魚和其他海洋動物。